iPCS Mobile App for Android

On your Android phone, go to the Google Play Store and search for iPCS
Download the iPCS app
Once downloaded, open the app and tap on the Settings button in the bottom right of the screen, and select Server

Enter the below server settings:

Address: voip.ertosunhouse.com
Port: 5000
User: the extension of your desk phone e.g. 505
Password: the PIN number for your extension

Once you have logged in, you can now use the in-app keypad and Contacts list to make phone calls. When you make phone calls, the number will be displayed as your office number.

While logged in to iPCS, you will remain logged in to your desktop phone. You can choose to answer calls on either; if you wish to transfer a call you have answered using iPCS to your desk phone, press the Call Select button on the phone to transfer the call to the phone.

To logout from iPCS, simply toggle the Enabled setting off again.